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The effect of injecting kynurenic acid into the DNLL on responses in inferior colliculus for ITDs between −1.0 and +1.0 msec. All injections were made into the DNLL contralateral to the recording site located in the central nucleus of the inferior colliculus. Open circles represent responses before injection, and filled circles show responses after the injection. Open squares shown in B andD represent responses obtained after a recovery period of at least 1 hr.
